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...ngda老大的资料安装成功postfix（地址在这里http://www.extmail.org/forum/archive/2/0510/563.html）。现在把我安装过程中遇到的问题及解决方法提供给大家，以方便新手。高手就不要看了
说明一下：Q代表安装过程中遇到的问题，或者是...
Difference between single quotes and double quotes in Javascript [duplicate]
...gle quotes where you want double quotes to appear inside the string (e.g. for html attributes) without having to escape them, or vice versa. Other than that, there is no difference.
However, note that JSON (JavaScript Object Notation) only supports double quoted strings.
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Confusion between factor levels and factor labels
There seems to be a difference between levels and labels of a factor in R.
Up to now, I always thought that levels were the 'real' name of factor levels, and labels were the names used for output (such as tables and plots). Obviously, this is not the case, as the following example shows:
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Why am I not getting a java.util.ConcurrentModificationException in this example?
Note: I am aware of the Iterator#remove() method.
10 Answers
10
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How do I change the language of moment.js?
... deprecated since moment 2.8.0, use locale() instead):
moment.lang("de").format('LLL');
http://momentjs.com/docs/#/i18n/
As of v2.8.1, moment.locale('de') sets the localization, but does not return a moment. Some examples:
var march = moment('2017-03')
console.log(march.format('MMMM')) // '...
.NET WebAPI Serialization k_BackingField Nastiness
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By default you don't need to use neither [Serializable] nor [DataContract] to work with Web API.
Just leave your model as is, and Web API would serialize all the public properties for you.
Only if you want to have more control about what's included, you then decorate your class ...
Vertically align an image inside a div with responsive height
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Here is a technique to align inline elements inside a parent, horizontally and vertically at the same time:
Vertical Alignment
1) In this approach, we create an inline-block (pseudo-)element as the first (or last) child of the parent, and set its height property to 100% to take all the...
Object comparison in JavaScript [duplicate]
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Unfortunately there is no perfect way, unless you use _proto_ recursively and access all non-enumerable properties, but this works in Firefox only.
So the best I can do is to guess usage scenarios.
1) Fast and limited.
Work...
SQL (MySQL) vs NoSQL (CouchDB) [closed]
I am in the middle of designing a highly-scalable application which must store a lot of data. Just for example it will store lots about users and then things like a lot of their messages, comments etc. I have always used MySQL before but now I am minded to try something new like couchdb or similar w...
Likelihood of collision using most significant bits of a UUID in Java
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According to the documentation, the static method UUID.randomUUID() generates a type 4 UUID.
This means that six bits are used for some type information and the remaining 122 bits are assigned randomly.
The six non-random bits...